In view of the early cracking problem of the steel plate reinforced concrete shear wall, the influence of steel plate slottingon the early crack resistance of the composite shear wall was studied. Firstly, based on the assumption of sectional constraint strain distribution, the approximate calculation formula of concrete constraint strain of the steel plate slottingreinforced concrete shear wall under isothermal load is derived. Then, the finite element analysis method is used to verify the availability of the approximate formula by example analysis and comparison. Through approximate formula and finite element analysis, it isshowed that under the negative isothermal load, slotting steel plate would increase the tensile strain of internal concrete and decrease the external, and when the length betweencenters of slots or the length of the steel plate is fixed, the larger the seam spacing is, the more obvious the internal increasing and external decreasing effect would be. Finally, through analysis and discussion, it is concluded that under certain conditions, the early cracking resistance of the steel platereinforced concrete shear wall could be improved by slotting the steel plate.